MECHANICAL ENGINEERING HYDRAULICS & FLUID MECHANICS MCQs

The velocity of a fluid particle at the centre of the pipe section is

Maximum

Minimum

Average

r.m.s.

Logarithmic average

Correct! Wrong!

The shear stress velocity gradient relation of the Newtonian fluids is

Linear

Parabolic

Hyperbolic

Involutic

here is no such relation

Correct! Wrong!

A perfect gas

Has zero viscosity

Has constant viscosity

Satisfies the relation PV = mRT

Is incompressible

None of the above

Correct! Wrong!

An ideal fluid is

Similar to a perfect gas

Frictionless and incompressible

One which obeys Newton's law of viscosity

One which satisfies continuity equation

One which flows through pipes with least friction

Correct! Wrong!

The units of kinematic viscosity are

kg/m2-sec

kg sec/m2

m/kg sec

m2/sec

m kg/sec

Correct! Wrong!

The units of dynamic viscosity are

Newton-sec/m2

Newton/m2

kg-sec/m

kg m2/sec

m2/sec

Correct! Wrong!

The critical depth on a channel is given by

h = v2/g

h = v2/2g

h = v/2g

h = 2v/g

h = v/g

Correct! Wrong!

The increase of temperature

Increases the viscosity of a fluid

Decreases the viscoisty of a fluid

Decreases the viscosity of a gas

Increases the viscosity of a gas

Both B and D

Correct! Wrong!

The bulk modulus of elasticity

Is independent of temperature

Increases with the pressure

Is independent of pressure and viscosity

Is larger when the fluid is more compressible

Correct! Wrong!

A barometer is used to measure

Very low pressures

Very high pressures

Pressure differeuce between two points

Pressure of fluid in a pipe line

Atmospheric pressure

Correct! Wrong!

1 N/m2 pressure is equivalent to

1 pascal

10^-5 bar

10^-2 kg/m sec2

7.5 x 10^-3mm Hg

Any of the above

Correct! Wrong!

A mercury water manometer indicates a gauge difference of 400 mm. The difference in pressure, measured in metres of water, is

0.4

0.8

1088

5.44

Correct! Wrong!

A pilot tube is used for the measurement of

Pressure

Velocity

Viscosity

Surface tension

Flow rate

Correct! Wrong!

A rotameter is a device used to measure

Velocity of fluid in pipes

Velocity of gauges

Vortex flow

Flow of fluids

Density of fluids

Correct! Wrong!

The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to

Density of the fluid

Specific weight of the fluid

Weight of the fluid

None of the above

Correct! Wrong!

The continuity equation

Expresses relationship between hydraulic parameters of flow

Expresses the relation between work and energy

Is based on Bernoulli's theorem

Is a relation for the momentum per unit volume for two points on a stream line

Relates the mass rate of flow along a stream line

Correct! Wrong!

Which two forces are most important in laminar flow between closely spaced parallel plates

Inertial, viscous

Pressure, inertial, inetial

Gravity, pressure

Viscous, pressure

None of the above

Correct! Wrong!

Pascal's law states that pressure at a point is equal in all directions

In a liquid at rest

In a fluid at rest

In a laminar flow

In a turbulent flow

Correct! Wrong!

Eulers dimensionless number relates

Buoyant force and viscous force

Viscous force and inertia force

pressure force and viscous force

none

Correct! Wrong!

If the specific speed of a turbine is 800 the turbine should be

Francis

Kaplan

Girard

Pelton wheel

Correct! Wrong!

The purpose of surge tank in a pipe line is to

Smoothen the flow of water

Minimise friction losses in pipe

Prevent occurrence of hydraulic jump

To relieve the pressure due to water hammer

To maintain the flow of water under emergency conditions

Correct! Wrong!

Essentially the gravity dam resists the loads to which it is exposed, due to its

Size

Volume

Mass

High tensile stress

Gravity

Correct! Wrong!

The value of bulk modulus of a fluid is required to determine

Reynold's number

Froude's number

Mach number

Euler's number

Correct! Wrong!

The kinematic viscosity is the

ratio of absolute viscosity to the density of the liquid

ratio of density of the liquid to the absolute viscosity

product of absolute viscosity and density of the liquid

product of absolute viscosity and mass of the liquid

Correct! Wrong!

According to equation of continuity,

w1a1 = w2a2

w1v1 = w2v2

a1v1 = a2v2

a1/v1 = a2/v2

Correct! Wrong!

The Bernoulli's equation is based on the assumption that

there is no loss of energy of the liquid flowing

the velocity of flow is uniform across any cross-section of the pipe

no force except gravity acts on the fluid

all of the above

Correct! Wrong!

The velocity corresponding to Reynold number of 2800, is called

sub-sonic velocity

super-sonic velocity

lower critical velocity

higher critical velocity

Correct! Wrong!

A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

2.89 kN

8.29 kN

9.28 kN

28.9 kN

Correct! Wrong!

he shear stress-strain graph for a newtonian fluid is a

straight line

parabolic curve

hyperbolic curve

elliptical

Correct! Wrong!

The length of the divergent cone in a venturimeter is __________ that of the convergent cone

equal to

double

three to four times

five to six times

Correct! Wrong!

An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.

equal to

directly proportional

inversely proportional

none

Correct! Wrong!

When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape ofWhen a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of

a triangle

a paraboloid

an ellipse

none of these

Correct! Wrong!

The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

path line

stream line

steak line

potential line

Correct! Wrong!

Falling drops of water become spheres due to the property of

surface tension of water

compressibility of water

capillarity of water

viscosity of water

Correct! Wrong!

The total energy of a liquid particle in motion is equal to

pressure energy + kinetic energy + potential energy

pressure energy - (kinetic energy + potential energy)

potential energy - (pressure energy + kinetic energy

kinetic energy - (pressure energy + potential energy)

Correct! Wrong!

A notch is used to measure __________ of liquids.

pressure

discharge

velocity

volume

Correct! Wrong!

The force present in a moving liquid is

inertia force

viscous force

gravity force

all of these

Correct! Wrong!

A flow in which the quantity of liquid flowing per second is not constant, is called

streamline flow

turbulent flow

steady flow

unsteady flow

Correct! Wrong!

The unit of surface tension is

N/m

N/m^2

N/m^3

N-m

Correct! Wrong!

In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

double

four times

eight times

sixteen times

Correct! Wrong!

MECHANICAL ENGINEERING HYDRAULICS & FLUID MECHANICS MCQs

The velocity of a fluid particle at the centre of the pipe section is

The shear stress velocity gradient relation of the Newtonian fluids is

A perfect gas

An ideal fluid is

The units of kinematic viscosity are

The units of dynamic viscosity are

The critical depth on a channel is given by

The increase of temperature

The bulk modulus of elasticity

A barometer is used to measure

1 N/m2 pressure is equivalent to

A mercury water manometer indicates a gauge difference of 400 mm. The difference in pressure, measured in metres of water, is

A pilot tube is used for the measurement of

A rotameter is a device used to measure

The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to

The continuity equation

Which two forces are most important in laminar flow between closely spaced parallel plates

Pascal's law states that pressure at a point is equal in all directions

Eulers dimensionless number relates

If the specific speed of a turbine is 800 the turbine should be

The purpose of surge tank in a pipe line is to

Essentially the gravity dam resists the loads to which it is exposed, due to its

The value of bulk modulus of a fluid is required to determine

The kinematic viscosity is the

According to equation of continuity,

The Bernoulli's equation is based on the assumption that

The velocity corresponding to Reynold number of 2800, is called

A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

he shear stress-strain graph for a newtonian fluid is a

The length of the divergent cone in a venturimeter is __________ that of the convergent cone

An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.

When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape ofWhen a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of

The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

Falling drops of water become spheres due to the property of

The total energy of a liquid particle in motion is equal to

A notch is used to measure __________ of liquids.

The force present in a moving liquid is

A flow in which the quantity of liquid flowing per second is not constant, is called

The unit of surface tension is

In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

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